Gaphor does not implement some Event sub-classes

[pbrown12303]

Is your feature request related to a problem?

Gaphor does not implement the following Event sub-classes:

• MessageEvent
• AnyReceiveEvent
• SignalEvent
• CallEvent
• TimeEvent

This makes it impossible to import models from other tools that use these classes and it limits the expressive power of Gaphor. I frequently use TimeEvents in my work.

Here's the UML model:

Here's the Gaphor model:

Describe the solution you'd like

Implement these classes

Describe alternatives you've considered

A clear and concise description of any alternative solutions or features you've considered.

Additional context

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